SABER-ULA, Universidad de Los Andes - Mérida - Venezuela >
Facultades >
Facultad de Ciencias >
Unidades de Investigación de la Facultad de Ciencias >
Grupos de Investigación >
Grupo de Química Ecológica >
Articulos, Pre-prints (Grupo de Química Ecológica) >

Título: Degradation Studies on Benzoxazinoids. Soil Degradation Dynamics of 2,4-Dihydroxy-7-methoxy- (2 H)-1,4-benzoxazin-3(4 H)-one (DIMBOA) and Its Degradation Products, Phytotoxic Allelochemicals from Gramineae.
Autores: Oliveros Bastidas, Alberto
Macías, Francisco A.
Marín, David
Castellano, Diego
Simonet, Ana M.
Molinillo G., José
Correo Electrónico:
Resumen: Degradation Studies on Benzoxazinoids. Soil Degradation Dynamics of 2,4-Dihydroxy-7-methoxy-(2 H)-1,4-benzoxazin-3(4 H)-one (DIMBOA) and Its Degradation Products, Phytotoxic Allelochemicals from Gramineae (Macías, Francisco A.; Oliveros, Alberto; Marín, David; Castellano, Diego; Simonet, Ana M. and Molinillo G., José M.) Abstract Benzoxazinoids have been described as important allelochemicals from Gramineae as well as Acanthaceae, Rannunculaceae, and Scrophulariaceae plants. Several bioactivities have been described and evaluated for these compounds, including fungistatic, antifeedant, and phytotoxic. In ongoing studies about allelochemicals as natural herbicide models, the description of soil dynamics in phytotoxic agents has high importance, because the possible biotransformations developed by soil microorganisms could yield compounds with modified biological properties, affecting the overall allelopathic capability of the producer plant in a direct manner. Thus, a complete degradation study has been carried out for 2,4-dihydroxy-7-methoxy-(2 H)-1,4-benzoxazin-3(4 H)-one (DIMBOA) and 6-methoxybenzoxazolin-2 (3 H)-one (MBOA) in two soils cultivated with Triticum aestivumL. Varieties (cv. Astron and cv. Ritmo). The main purpose was to identify degradation products and to elucidate biotransformation dynamics. Results show DIMBOA to degrade rapidly, yielding MBOA in both studied soils at different doses ( t1/2 ) 31 ( 1 h, n) 12) and reaching high conversions (80 ( 4 h, n) 42). MBOA, an intermediate in the degradation pathway from DIMBOA to 2-amino-7-methoxy-3 Hphenoxazin-3-one (AMPO), was more resistant toward biodegradation ( t1/2 ) 5 ( 1 days, n) 6). MBOA showed maximum conversions at a dose of 250 mg/kg of soil (36 ( 3 days, n ) 6). Soil belonging to T. aestivum cv. Ritmo crops showed higher degradation capacity than cv. Astron soil. AMPO was the final degradation product observed for DIMBOA in the soils and experimental conditions selected. Consequences for activity and stability of these compounds in relation to allelopathy are discussed. © 2004 American Chemical Society Published on: Journal of Agricultural and Food Chemistry 2004, 52, 6402-6413.
Fecha: 27-Jul-2005
Palabras Claves: Grupo de Química Ecológica
Palabras Clave: Allelopathy
Soil degradation
Aparece en colecciones:Articulos, Pre-prints (Grupo de Química Ecológica)
Articulos, Pre-prints (Facultad de Ciencias)

Archivos en estos artículos:

Archivo Descripción TamañoFormato
degradation_studies_benzoxazinoids.pdf203.24 kBAdobe PDFVer/Abrir
resumen.htm2.41 kBHTMLVer/Abrir

Todos los artículos en Dspace están protegidos con Derecho de Autor, todos los derechos reservados, a menos que se indique lo contrario.


Licencia Creative Commons
Todos los documentos publicados en este repositorio se distribuyen bajo una
Licencia Creative Commons Atribución-NoComercial-CompartirIgual 3.0 Venezuela.

Repositorio Institucional de la Universidad de Los Andes, Mérida, Venezuela - Comentarios
Software DSpace Copyright © 2002-2007 MIT and Hewlett-Packard -
DSpace Add-on Statistics of RepositóriUM © University of Minho.